A. efficient B. tennis C. summit D. cross A. twin towers B. yours faithfully C. yours sincerely D. jacket A. purple B. fill with sth C. care D. Double Ninth Festival A. ha ha B. gift C. adventurer D. be ready for A. clone B. distinguished C. carry D. only A. labyrinth B. admission C. pretty D. let off A. letter B. under C. inadequate D. up to now A. civilization B. first C. doorbell D. anyhow A. seriously B. be concerned about C. importantly D. be good at A. steady B. eat breakfast C. object D. which